Just to clarify that there is NO way to cast level 9 spells from memory unless you remove the cap (or wait for the add on where the cap goes up to 8m XP. A high INT only allows you to SCRIBE the spells in your spellbook. INT governs the number and level of spells you can scribe onto your spellbook, while level and experience determines if you can cast them.
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Memnoch - Custodian of the Order of the Holy Flame